This study (4 weeks) was carried out to evaluate resistance of Acipencer percicus larvae against salinity, temperature, ammonia and pH stresses at the end of experimental period. Bacillus bacteria (B. licheniformis, B. subtilis and B. circulans)(three species in a commercial preparation, Protexin Aquatic) were bioencapsulated within Daphnia magna at three concentrations by holding the Daphnia in suspensions of 1× 10, 2× 10 and 3× 10 bacteria per milliliter for 10 hours (T1, T2 and T3, respectively). The sturgeon larvae in 7 7 7 experimental treatments were fed one of the three probiotic treatments at a level of 30 percent body weight 5 times a day but larvae in control treatment (C) fed by unbioencapsulated Daphnia. We prepared five stressor factors to challenge Acipencer percicus after 28 days feeding, trial that's included: pH (2 and 13), salinity (120ppt/l), temperature (35 C), and ammonia (2.5 mg/l) challenge. Experimental larvae after feeding via bioencapsulated Daphnia by probiotic bacilli gave a relative percentage survival rate in comparison with control treatment (P< 0.05). The analyses were based on challenge test data (as seconds) from four treatments. In conclusion, bioencapsulated Daphnia with probiotic bacilli could enhances the resistance against stresses in Acipencer percicus.